It's easy to sometimes go through phases of your life where you feel you are in a rut, finding little joy in anything.
I find it good to have something to work on as a project that I can accomplish. I think everyone needs some goal whether it is building or creating something or helping others in some way. It gives us the purpose to get out of bed each morning.
Constantly looking back at the effect of the JW experience on our life is inevitable but doesn't help. But I think people often overlook the good times we enjoyed.
It's like leaving a crappy job you hate. Only years later do you think about the good experiences you had as part of it and maybe the people that our lives momentarily overlapped to our benefit.
One thing I've found that helps, which sounds utterly trivial, is to set a goal to make a stranger that you meet laugh or just smile that day. Like any "giving" it ends up making you feel great.